MARTINSVILLE, Va. — Kevin Harvick and Richard Childress had pledged to finish off their relationship professionally with Harvick leaving for Stewart-Haas Racing after 2013.

They did that all season. Until Harvick and Childress grandson Ty Dillon tangled Saturday during the Camping World Truck Series race Saturday afternoon at Martinsville Speedway.

Dillon and his brother, Austin, are considered the future of RCR, and Harvick said the focus on them is why he’s leaving RCR. When Harvick stopped in Dillon’s pit stall after their wreck, a Dillon crew member apparently threw a hammer at Harvick’s truck, which is owned by NTS Motorsports.

“I don’t care what they throw at me,” an angry Harvick said as he left the track before the race was even over. “That’s exactly the reason I’m leaving RCR is because you’ve got those punk-ass kids coming up.”

Childress used an expletive in talking about Harvick while going into the NASCAR hauler. He was a little calmer about 10 minutes later.

“I’m very disappointed — that’s all I can say,” Childress said. “I’ve got too much class to say what I want to say right now.

“When I say it, I will say it to his face.”

Harvick is tied for third in the Sprint Cup standings, 26 points behind leader Jimmie Johnson. Childress said the episode Saturday would not impact Harvick’s status for Sunday’s race.

“We’re still rolling,” Childress said.

Dillon entered the race second in the truck standings, 57 points behind the series leader Matt Crafton.

Harvick and Dillon tangled with 12 laps left in the race as they battled for second. Harvick was in second and hit from behind by Dillon, and then Matt Crafton ran into the back of Dillon, causing more damage.

Dillon and Harvick bumped trucks on the first caution lap and then Harvick stopped in Dillon’s pit box. Dillon’s team ran out to Harvick’s truck, yanking at his window net and apparently throwing a hammer.

“I’m pretty disappointed in the things that just went down,” Dillon said. “I used to look up to that guy but I guess he doesn’t understand the circumstances of what’s going on. … To tear up a truck after the race and act like a punk on the track and on pit road and stop on pit road in my pit stall when my guys were coming out, that was pretty ridiculous.”

Harvick was in no mood to stick around.

“Exactly the reason why I’m leaving RCR because you’ve got those kids coming up and they’ve got no respect for what they do in this sport and they’ve had everything fed to them with a spoon,” Harvick said.

“So I cut him slack all day and, you know, he just dive-bombs me in there, dumps me. … It’s a shame you’ve got to get taken out by some rich kid like that.”